The commentator did not seem afraid that ISIS would blow up the dam. They control Moslel and they would kill their own troops. Their worry was ISSI will not maintain the damn, and it will break up due to lack of maintenance.
Keep in mind ISIS has declared itself a “State” and that the Caliphate is now in full swing....it's been celebrated by mostly all Muslims who've hoped for this....so they will sit aside whatever brutalities ISIS is doing for the ultimate goals it's attempting to establish. ...and I will say again where is the moslem outcry against these atrocities? There will be none because they "all" know what this means.